Temporal Variation of Nitrogen and Sulfur Species of Food Waste and Sludge during Anaerobic Co-Digestion

Pengzhou Kang, Yuxiu Zhang, Xiaopeng Ge and Zhi Qian
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Pengzhou Kang: School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Yuxiu Zhang: School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Xiaopeng Ge: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Zhi Qian: College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

Sustainability, 2022, vol. 14, issue 9, 1-16

Abstract: Anaerobic co-digestion (AcoD) has been a widely accepted method to treat food waste (FW) and sewage sludge (SS). However, there is a knowledge gap regarding the key speciation transformation of nitrogen and sulfur in AcoD. Here, we explored the changes of nitrogen (N) and sulfur (S) compounds in liquid digestion and biogas, as well as the composition of microbial community structure and related metabolic functions. The results showed that H 2 S in the biogas was the main form of S in the early stage, and then, it was converted into SO 4 2 − and SO 3 2− , while NH 3 and NH 4 + were the main forms of N during the AcoD. In addition, bacterial diversity was associated with N and S compounds; Syntrophomonas and Aminobacterium were positively correlated to H 2 S, NH 3 , NH 4 + and SO 3 2 − , and Saccharibacteria_genera_incertae_sedis , Candidatus_Cloacamonas and Thermomonas were positively correlated to SO 4 2 − and NO 2 − . Additionally, the FAPROTAX prediction showed that the functional composition related to N and S metabolism was different from SS and inoculum after the AcoD. This study provides detailed information of conversion of N and S of the AcoD, which could lay a foundation for the subsequent regulation of the mechanism of nitrogen and sulfur compounds in the methanogenic process.

Keywords: food waste; sewage sludge; anaerobic co-digestion; nitrogen; sulfur (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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